Precious stone



FIG. 1 is a front view of a precious stone showing my new design;

FIG. 2 is a side view;

FIG. 3 is a top view;

FIG. 4 is a bottom view;

FIG. 5 is an isometric view; and,

FIG. 6 is a top view, seen through to the bottom, of FIG. 5. 

The ornamental design for a precious stone, as shown and described. 